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SubjectRe: Possible memory leak via alloc_pid()
Oleg Nesterov <oleg@redhat.com> writes:

> On 07/31, Catalin Marinas wrote:
>>
>> On Thu, 2009-07-30 at 23:29 +0200, Oleg Nesterov wrote:
>> >
>> > Since you can reproduce the problem easily, perhaps you can use the
>> > hack above to track get/put ?
>> >
>> > $ echo pid_of_Xorg > /proc/sys/kernel/xxx
>>
>> Below is the minicom capture. By the time Xorg dies, the count is 2.
>
> Thanks a lot Catalin.
>
>> When logging out, there are two counter incrementing events via
>> sys_wait4 and sys_ioctl, thoush I'm not sure whether they are
>> unbalanced.
>
> wait4() is right, ioctl() looks fine too.
>
>> pgrep Xorg
>> 1519
>> 10:~# pgrep Xorg > /proc/sys/kernel/xxx
>> XXXXX(1519) ==22
>
> Unfortunately there is nothing which looks like a leak. I gueess it is
> too late to start the tracking.
>
> I'm afraid this won't really help too, but since nobody has a better
> idea for now, perhaps you can do another test?
>
> Pleas rename Xorg to Xorg.origin, and make a simple Xorg script which
> does something like
>
> #!/bin/sh
>
> echo $$ >> /proc/sys/kernel/xxx
> exec /path/to/Xorg.origin $*
>
> perhaps even this is too late, gdm can do a lot before execing.
>
> Please avoid pgrep/ps/etc, proc adds a lot of noise. Better yet, it
> would be nice to start/stop Xorg with /proc unmounted, but I don't
> know is this can work without /proc.

Hmm. I'm starting to wonder if kmemleak is right. I don't know how
it works but something about the way pids are used might be confusing it.

Eric


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